Cowl of True Sight
Using this you realise what a masterpiece the Room was with its hidden intricacies and clever plot points. Sorry I couldn't think that with a straight face. I still love you Tommy Wiseau.
Given to you by Alexander I don't know if you get it if you kill him probably not though to deal with the Sallow Man should you decide to team up. Alexander is located at the Elven temple.
The Eternal Stormblade
I Arthur shalt pull out thine sword and become King of England. I hereby name ye Excalibur. I swear to Merlin if any of criticise me for bad English I will give you a taste of what real magic is.
Located in a cave with some REALLY suspiciously placed Sentinels around it. Just look at the picture of the map you probably don't care about this part anyway.
Hilt of the Swornbreaker
I honestly I think I'm missing something here or it's just a pointless item that was made unique. Probably the latter.
Anyway it is located in the War room (Pretty menacing right?) in a chest. The war room is in the Sallow Man's cave which is the cave guarded by the troll next to the lunar temple. Honestly it's quite hard to miss.
The Sallow Man is quite a bad description considering there are a lot of heavy smokers in our day and age. Don't get it don't blame ya it wasn't that funny anyway.
Basically kill The Sallow Man. He's in the cave by the Lunar Temple which is guarded by a troll. It's quite hard to miss.